Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 137 (ANTILOCK BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B273ACOMPONENT TESTING
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol
Component Testing
2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Component Testing
WARNING: This page is about a different car, the 2019 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X1 harness connector at the S48A Multifunction Switch - Instrument Panel.
- Test for infinite resistance between the signal terminal 4 and the ground terminal 14 with the switch in the open position.
- If less than infinite resistance
Replace the S48A Multifunction Switch - Instrument Panel.
- Go to next step: If infinite resistance
- If less than infinite resistance
- Test for less than 2 Ω between the signal terminal 4 and the ground terminal 14 with the switch in the closed position.
- If 2 Ω or greater
Replace the S48A Multifunction Switch - Instrument Panel.
- Go to next step: If less than 2 Ω
- If 2 Ω or greater
- All OK.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.